Magnesite

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Physical & Optical Properties

Mohs Hardness 3,5 – 4,5
Specific Gravity 2,92 – 3,12
Refractive Index 1,509 – 1,72
Crystal System Trigonal
Luster Vitreous,Dull
Cleavage Perfect
Fracture Conchoidal
Color various
Birefringence 0,19
Pleochroism Nil

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Magnesite
Mohs hardness of Magnesite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Magnesite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

Treatments

Dyed to imitate lapis, turquoise (chelsea: common reddish), coral. Acetone test - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 8 3.5 to 4.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.92 to 3.12Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references ConchoidalArthur Thomas, Gemstones (2009) 1.509 to 1.720Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Uniaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.190 to 0.202Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) DoublingMore from other references NilArthur Thomas, Gemstones (2009) NilArthur Thomas, Gemstones (2009) White, yellow, brown, black, colourlessUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Vitreous,DullWalter Schumann, Gemstones of the world (2001) More from other references Blue, green, white commonHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Blue green or white fluorescence may be seen with greenish phosphorescenceMichael O?Donoghue, Gems, Sixth Edition (2006) GreenishHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references MassiveMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references Magnesite occurs as a primary mineral in igneous or sedimentary rocks or may be formed by the metamorphism or alteration of serpentine and peridotite.Michael O?Donoghue, Gems, Sixth Edition (2006) Magnesite information at mindat.org Brazil&nbsp; Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 426 Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 426

About Magnesite

Magnesite é um mineral de carbonato de magnésio que ocorre em tonalidades brancas a acinzentadas, por vezes com veios ou padrões castanhos. Embora raramente transparente o suficiente para ser talhada como gema, a magnesite é frequentemente tingida para imitar turquesa, criando controvérsia no mercado de gemas. Forma-se pela alteração de rochas ricas em magnésio em condições hidrotermais ou de intemperismo. Depósitos de qualidade gemológica provêm de Espanha, Turquia e Brasil. A magnesite natural não tratada é apreciada por colecionadores pelas suas formações cristalinas e inclusões padrão.

Science FYI Family

Frequently Asked Questions

What is Magnesite?
Magnesite é um mineral de carbonato de magnésio que ocorre em tonalidades brancas a acinzentadas, por vezes com veios ou padrões castanhos. Embora raramente transparente o suficiente para ser talhada como gema, a magnesite é frequentemente tingida para imitar turquesa, criando controvérsia no mercad
What is the hardness of Magnesite?
Magnesite has a Mohs hardness of 3.5 to 4.5, making it relatively soft for use in jewelry.
What color is Magnesite?
Magnesite is primarily Various.
How much does Magnesite cost?
Magnesite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Magnesite?
Magnesite belongs to the Trigonal crystal system.

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